Composition of Air Flow Meter| nitrogen flow meter

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1. What is the structure of the mainstream measurement method hot wire air flow meter?

1. Introduction to Air Flow Meter The function of an air flow meter is to measure the amount of fresh air entering the engine intake manifold and the intake temperature. Based on this information, the ECU corrects the fuel injection amount, limits smoke, and controls the EGR opening.

2. Installation Position The sensor is installed on the engine intake pipe, at the rear end of the air filter. 3. Working Principle 3.1. The principle of an air flow meter The air flow sensor integrates some electronic components on a ceramic substrate. When the engine is working normally, it first heats the diaphragm, and when fresh air flows through the sensor, it takes away some of the heat. At this time, the ECU will control the Wheatstone bridge on the diaphragm to supplement the heat, which will cause changes in the electrical signal. When the signal is transmitted to the ECU, The ECU will calculate the intake air volume based on this change. 3.2. The principle of the air temperature sensor. The intake air temperature sensor is a resistor with a negative temperature coefficient. When the intake air temperature changes, the resistance value of the resistor will change, which will cause a change in the signal voltage at the ECU end. The ECU calculates the intake air temperature based on this change. 3.3. Determination of airflow direction: There are two temperature resistors at each end of the hot film of the air flow meter. When the airflow passes through the hot film, it will take away some heat, so the temperature at the front end of the hot film is lower than that at the rear end. The ECU determines the direction of the air

flow based on this signal! 4. Circuit diagram of air flow meter. 5. Control strategy: The ECU will constantly monitor the working condition of the air flow meter. When the ECU determines that the air flow meter has a fault, it will take corresponding control measures. The bending pin is as follows: 4.1. The engine MIL light will light up, the EGR system will stop working, and the exhaust gas will no longer participate in the system operation; 4.2. The engine speed will be limited to a certain speed, resulting in limited power; 4.3. When the air flow meter malfunctions, the engine can start normally without being affected;

2. Detection of Air Flow Meter: Fault Codes Related to Air Flow Meter

2. What are the 5 lines of the air flow meter?
? The 5 wires of the air flow meter include two intake temperature wires, one is a live wire and the other is a signal wire; The other three wires include a live wire, a ground wire, and a signal wire. The pre air flow meter works by converting the inhaled air flow rate into an electrical signal, with minimal pressure loss and a wide measurable flow range. The ratio of maximum flow rate to minimum flow rate is generally above 20:1, suitable for a wide range of industrial pipe diameters, up to 3m. Its output signal has a linear relationship with the measured flow rate, and has high accuracy. It is suitable for measuring the fluid flow rate of acid, alkali, salt solutions, water, sewage, corrosive liquids, mud, and slurry with conductivity ≥ 1 μ s/cm, but cannot measure the flow rate of gas, steam, and purified water. The principle classification of air flow meters is diverse. The blade type air flow meter has a simple structure and high reliability, but it has high intake

Composition of Air Flow Meter

1. What is the structure of the mainstream measurement method hot wire air flow meter?

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